| Year | Value | | 2021 | 2,747.3004617004 | | 2020 | 2,481.4235409877 | | 2019 | 2,423.3955673646 | | 2018 | 2,287.4020782442 | | 2017 | 2,103.2556459604 | | 2016 | 2,078.6354354245 | | 2015 | 2,043.6069765707 | | 2014 | 1,861.6160069871 | | 2013 | 1,611.2186126856 | | 2012 | 1,155.7884177014 | | 2011 | 1,070.8935467522 | | 2010 | 973.70773001079 | | 2009 | 993.58147276005 | | 2008 | 1,025.5184915776 | | 2007 | 904.55205219524 | | 2006 | 869.14852709766 | | 2005 | 825.70074893152 | | 2004 | 794.87343405347 | | 2003 | 757.52491775057 | | 2002 | 732.3667601468 | | 2001 | 730.026765166 | | 2000 | 730.85804451327 | | 1999 | 728.69248884289 | | 1998 | 717.66036705433 | | 1997 | 736.30502369099 | | 1996 | 754.06696304132 | | 1995 | 785.46500005674 | | 1994 | 781.52747104001 | | 1993 | 777.15722365407 | | 1992 | 772.69358036722 | | 1991 | 740.4238521754 |
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